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Suction Catheters are flexible, long tubes used to remove respiratory secretions from the airway. The purpose of suctioning is to keep the airway clear of secretions and to prevent plugging. One end of the suction catheter is connected to a collection container (suction canister) and a device that generates suction. The open end is advanced through the airway (endotracheal or tracheostomy tube) to remove secretions.